Plausibility of 2 gallon electric hot water heater?

Living in one of the coldest regions of the continental U.S., solar often falls short of providing water suitable for washing. Being a camper at heart, I don't need a lot of hot water. Laundry is done at my Denver bungalow every two weeks. I like to wash more than every two weeks of course. Having spent 14 months in various casts after a significant climbing fall, washcloth bathing is pretty familiar.

I could not resist an older 2 gallon unused, still in the box, Reliant electric hot water for less than $50. It consumes 1400 watts but is insulated and is a small 2 gallon unit. Convenience lies in simply plugging it in. The heating element carries a lifetime warranty which means nothing at this time other than pointing at a somewhat likely robust heating element.

I plan to gravity feed it from my 200 gallon holding tank. The hardware store plumbing guy sold me two brass 1/2" male to male fittings for the inlet and outlet at $4.50/each. Perhaps possible corrosion issues makes this a wise choice? I already have 1" Spears valves to control water flow. Plus T's and hosing. So hooking it up looks like $9 for the brass fittings...so far.

Experienced off gridder's see a problem with this? Perhaps I should put a timer on the electric plug and only run it during solar hours.......

My unused propane hot water heater is 50 gallons and would consume a lot of propane.

Spear seems to make only PVC/CPVC material valves rated for 73F nominal maximum temperatures (i.e., cold water only). You will probably need a "heat trap" of some sort to prevent the heat from rising up to the voltage (i.e., both cold water and hot water pipes should go "up" to the heater (or, for example, up the sides of the water heater to the top, if top pipe connections). This will keep the cold water valve cool, and prevent hot water from "leaving" the hot water tank and costing you wasted energy.

Also, if I recall correctly, you have very cold weather/winters... Ability to drain system/preventing freezing will be important too (not that a guy from sunny California needs to tell you this ).

And the Brass couplings (and 6" of brass pipe or so) is a good transition from iron pipe (and water heater tanks) to copper systems (if not using a dielectric union).

Spear seems to make only PVC/CPVC material valves rated for 73F nominal maximum temperatures (i.e., cold water only). You will probably need a "heat trap" of some sort to prevent the heat from rising up to the voltage (i.e., both cold water and hot water pipes should go "up" to the heater (or, for example, up the sides of the water heater to the top, if top pipe connections). This will keep the cold water valve cool, and prevent hot water from "leaving" the hot water tank and costing you wasted energy.

Also, if I recall correctly, you have very cold weather/winters... Ability to drain system/preventing freezing will be important too (not that a guy from sunny California needs to tell you this ).

And the Brass couplings (and 6" of brass pipe or so) is a good transition from iron pipe (and water heater tanks) to copper systems (if not using a dielectric union).

-Bill

Could we get a little more technical? Though you likely saved me some grief while pointing out the curious rating for the Spears valve. PVC valves are frequently uses in irrigation and aquariums. So I will use a brass valve,

There will be no real system. Just gravity feed from the holding tank...the temperature in the sunroom never drops below 38F that I recall. Warms up nicely during the day since this area is rated as an alpine desert....very sunny.

Almost always in Float by noon. Right now I would lean more towards ~ 11am - 1pm.

It has no thermostat setting. It probably runs much hotter than I need for bathing.

I have no real expertise on my Absorb and Float cycles. Having installed the electronics in a cool, dark spot that takes an effort to get to. Some people study their charge controller doing it's work, I do not.

If you have abundant sun and your talking about using where you have the signature setup...

You could just run a full size water heater, put a timer on this or a full size water heater. I have been running a 3600 240 water heating element off of 120 (at @900 watts) for 5 years. It's worked out okay, Takes perhaps 4-5 hours in the summer when in coming water is warm and 7-8 maybe in the winter when water comes in very cold. You could setup a 'holding tank' inside to preheat the water to inside temps.

Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites, Midnite E-panel, Prosine 1800 and Exeltech 1100, ForkLift battery. Off grid for @13 of last 14 years. 1000 watts being added to current CC, @2700 watts to be added with an additional CC.

I have an unused 50 gallon propane tank that some bloke talked me into. Everything freezes for six months out of the year...except for the bedroom and sunroom. The sunroom dips into the 30's, when I am making breakfast , at times.

People think I have a life of leisure because of good solar and a large "place"....it is actually a shop. They could not be more wrong. I am simply tired of a lot of people and idiotic government. I would rather be poor than graft a higher income from such.

Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites, Midnite E-panel, Prosine 1800 and Exeltech 1100, ForkLift battery. Off grid for @13 of last 14 years. 1000 watts being added to current CC, @2700 watts to be added with an additional CC.

I have one of the cheapest, lowest output "instahot" type propane powered water heaters. It sells for less than $100.00. It has never failed to operate and works great. Granted it only heats fast enough for a single load. Ours is used for a outdoor shower on our RV. They come in a wide variety of outputs and price ranges. We have a Bosch brand at our Baja house. They are a bit more expensive.

I have one of the cheapest, lowest output "instahot" type propane powered water heaters. It sells for less than $100.00. It has never failed to operate and works great. Granted it only heats fast enough for a single load. Ours is used for a outdoor shower on our RV. They come in a wide variety of outputs and price ranges. We have a Bosch brand at our Baja house. They are a bit more expensive.

With regards to Bosch instantaneous water heaters, keep your purchase receipt for warranty claims, the heat exchanges are prone to failure by leakage, the warranty is good, as long as the reciept is available, based on experience, 3 failures in 3 installations, same problem.

I have one of the cheapest, lowest output "instahot" type propane powered water heaters. It sells for less than $100.00. It has never failed to operate and works great. Granted it only heats fast enough for a single load. Ours is used for a outdoor shower on our RV. They come in a wide variety of outputs and price ranges. We have a Bosch brand at our Baja house. They are a bit more expensive.

With regards to Bosch instantaneous water heaters, keep your purchase receipt for warranty claims, the heat exchanges are prone to failure by leakage, the warranty is good, as long as the reciept is available, based on experience, 3 failures in 3 installations, same problem.

In my case one came with the house,(no receipt), still works, I bought a brand new one for $50.00 from another homeowner in Baja. He installed a new shower valve and tiled the shower, only to find the flow rate of the shower isn't high enough to spin the heaters impeller fast enough to generate spark. I would have removed all water saving features of the shower valves/head. He gave me an extra copper heat exchanger as well, but no receipt as far as I know. I will look through whatever paperwork I may have gotten with it. It has been sitting for over a year now and I don't recall if I ever did get paperwork.

I often wonder what happens when saltwater is used for showers, dish washing, and laundry. Other than leaving some salt and calcium residue...

Sailors did not often have the luxury of freshwater until pretty recently. I do not recall saltwater R/O systems being viable even 30 years ago. Though their only real difference is running at 800-900psi instead of 40-125 psi. Brackish R/O systems are run at pressures commensurate with the level of salinity of course.

I often wonder what happens when saltwater is used for showers, dish washing, and laundry. Other than leaving some salt and calcium residue...

Our brackish water isn't drinkable, obviously. For dishwashing We do need to towel dry our dishes and silverware to avoid haze and spotting. For showering it doesn't seem to be a problem. shampoo and body wash works just fine. Again towel drying is recommended, lol. The washer and dryer are going to be added next month but many of our friends and neighbors use clothes washers regularly. I imagine they might not last as long as if they were used with pure fresh water.

There are many opinions on the subject of hot water heating in off grid systems. Because solar electricity is not cheap to generate, most people will consider using only the free, excess power to heat water. That's what I do. We have an off grid seasonal cabin, used continously May - October (5+ months ). We use propane for the stove/oven and for water heating. Prior to switching to our hybrid electric/LPG we used only the Atwood propane water heater. We could run the heater for about 3 weeks on a 20 lb tank unless there were lots of people (more than 6) at the cabin. We have a dishwasher which we use every day or two, depending on number of people. My best estimate is that we used from 1 to 1.5 lbs. of propane per day, probably 80% of it for hot water. Showers are not normally a big consumer of hot water. We have a wood fired hot tub and a clean but cold lake. Most people, but not all, find that sufficient for keeping clean but people can shower anytime they wish.Since installing our opportunity hybrid system, our propane use is now 100 lbs per 150 days, or about 1/3 lb per day. (Stove and hot water heater now run off of one 100# tank.)

The electric water heater feeds the propane heater. I keep the thermostat on the propane heater colder (but still plenty hot) than the non adjustable electric heater. From May thru August 90% of our hot water is solar generated. Thay percentage drops pretty quickly as the days get shorter, but that is included in my averages. One thing to note is that I use the pilot light model Atwood heater. The pilot alone keeps the water hot, in fact hotter than the reduced thermostat setting. I don't know how much propane the the pilot uses, but it can't be much.

The electric heater is controlled by the relay which is controlled by the charge controller. I have it set to turn on the heater when the batteries reach 60 volts (absorb setting) and turn off at 49.9 volts, .1 volts below the recharge setting. I have kept a very watchful eye on the batteries, checking SG regularly and they seem to like this setting. The heater never comes on at night or if is really cloudy but the gas heater takes over seamlessly.

We use between 9 - 12 kwh per day, the variables being automatic dishwasher, laundry, and extra running of the water pump (220 volt submersible) to change the hot tub water (500 gallons). We can manage consumption during cloudy periods, the dishwasher, for example uses 2 kwh between washing and heating water. Some might say that they want or need more hot water capacity, but we find that we have plenty and never run out.

This setup works pretty well for our system and needs. I hate hauling propane all by boat or over the ice in winter. One tank a year now.

If you have any amount of hardnwess to your water you wn=ant to make sure you hae a TOP LINE water softener otherwise the warranty on your Instantaneous heater can be voided.. My experience- 3 high efficiency DHW heaters and all failed, the one with a small tank < 10 Gallons (Lenox Complete Heat now discontinued) and a couple of Korean with a ''10 year warranty'' that suddenly was in jeopardy as the water softener was failing to do the job on 64 grains of harness plus 5 grains of dissolved IRON from a FeRO-Bacter... bad stuff on porcelain.toilets!Stick with the old style tanks..

Surprised to see some action on this old idea. I have decided that heating water with propane is so comparatively fast and efficient that I will likely continue doing it that way.

I have six large solar water "heaters"...........4' x 10' I think. I should get off my rear and get at least one working. Made in the 80's......good chance they would still work I think. Unless the interior copper piping ruptured....which is always possible.